This should play if your Web browser has WebAssembly enabled (most do). Most examples will play unless they need to load files. The first time you click Play, Csound will spend a few seconds loading, then play. You can edit this code and replay it.
; Select audio/midi flags here according to platform -odac -Q1 ;;;realtime audio out with MIDI out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 instr 1 ; change attack time of external synth initc7 1, 6, 0 ; set controller 6 to 0 nrpn 1, 99, 1 ; set MSB nrpn 1, 98, 99 ; set LSB katt ctrl7 1, 6, 1, 127 ; DataEntMSB idur = 2 noteondur2 1, 60, 100, idur ; play note on synth endin i 1 0 3 e